<template>
  <div class="detail">
    <Header/>
    <div class="main">
      <div class="course-info">
        <div class="wrap-left">
          <videoPlayer class="video-player vjs-custom-skin"
                       ref="videoPlayer"
                       :playsinline="true"
                       :options="playerOptions"
          >
          </videoPlayer>
        </div>
        <div class="wrap-right">
          <h3 class="course-name">{{course.name}}</h3>
          <p class="data">{{course.students}}人在学&nbsp;&nbsp;&nbsp;&nbsp;课程总时长：{{course.lessons}}课时/{{course.lessons==course.pub_lessons?'更新完成':`已更新${course.pub_lessons}个课时`}}&nbsp;&nbsp;&nbsp;&nbsp;难度：{{course.level_name}}</p>
          <div class="sale-time">
            <p class="sale-type" v-if="course.has_time>0">{{course.discount_name}}</p>
            <p class="sale-type" v-else>¥{{course.price}}</p>
            <p class="expire" v-if="course.has_time>0">距离结束：仅剩 {{parseInt( course.has_time/(24*60*60) ) | time_format}}天
              {{parseInt(course.has_time/3600%24) | time_format}}小时 {{parseInt(course.has_time/60%60) | time_format}}分
              <span class="second">{{parseInt(course.has_time%60) | time_format}}</span> 秒</p></div>
          <p class="course-price" v-if="course.has_time>0">
            <span>活动价</span>
            <span class="discount">¥{{course.discount_price.toFixed(2)}}</span>
            <span class="original">¥{{course.price}}</span>
          </p>
          <div class="buy">
            <div class="buy-btn">
              <button class="buy-now">立即购买</button>
              <button class="free">免费试学</button>
            </div>
            <div class="add-cart" @click="add_cart"><img src="/static/image/cart-yellow.svg" alt="">加入购物车</div>
          </div>
        </div>
      </div>
      <div class="course-tab">
        <ul class="tab-list">
          <li :class="tabIndex==1?'active':''" @click="tabIndex=1">详情介绍</li>
          <li :class="tabIndex==2?'active':''" @click="tabIndex=2">课程章节 <span :class="tabIndex!=2?'free':''">(试学)</span>
          </li>
          <li :class="tabIndex==3?'active':''" @click="tabIndex=3">用户评论 (42)</li>
          <li :class="tabIndex==4?'active':''" @click="tabIndex=4">常见问题</li>
        </ul>
      </div>
      <div class="course-content">
        <div class="course-tab-list">
          <div class="tab-item" v-if="tabIndex==1">
            <div v-html="course.brief"></div>
          </div>
          <div class="tab-item" v-if="tabIndex==2">
            <div class="tab-item-title">
              <p class="chapter">课程章节</p>
              <p class="chapter-length">共{{chapter_list.length}}章 {{course.lessons}}个课时</p>
            </div>
            <div class="chapter-item" :key="key" v-for="chapter,key in chapter_list">
              <p class="chapter-title"><img src="/static/image/1.svg" alt="">第{{chapter.chapter}}章·{{chapter.name}}</p>
              <ul class="lesson-list">
                <li class="lesson-item" v-for="lesson in chapter.lessons">
                  <p class="name"><span class="index">{{chapter.chapter}}-{{lesson.lesson}}</span> {{lesson.name}}<span
                    class="free" v-if="lesson.free_trail">免费</span></p>
                  <p class="time">{{lesson.duration}} <img src="/static/image/chapter-player.svg"></p>
                  <button class="try" v-if="lesson.free_trail">立即试学</button>
                  <button class="try" v-else>立即购买</button>
                </li>

              </ul>
            </div>
          </div>
          <div class="tab-item" v-if="tabIndex==3">
            <!--高速版-->
            <div id="SOHUCS" :sid="course_id"></div>
          </div>
          <div class="tab-item" v-if="tabIndex==4">
            常见问题
          </div>
        </div>
        <div class="course-side">
          <div class="teacher-info">
            <h4 class="side-title"><span>授课老师</span></h4>
            <div class="teacher-content">
              <div class="cont1">
                <img :src="course.teacher.image">
                <div class="name">
                  <p class="teacher-name">{{course.teacher.name}}</p>
                  <p class="teacher-title">{{course.teacher.signature}} {{course.teacher.title}}</p>
                </div>
              </div>
              <p class="narrative">{{course.teacher.brief}}</p>
            </div>
          </div>
        </div>
      </div>
    </div>
    <Footer/>
  </div>
</template>

<script>
    import Header from "./common/Header"
    import Footer from "./common/Footer"

    import {videoPlayer} from 'vue-video-player';

    export default {
        name: "Detail",
        data() {
            return {
                course_id: "",  // 当前课程的ID
                course: {       // 当前课程信息
                    teacher: {}
                },
                chapter_list: [], // 章节列表
                tabIndex: 2, // 当前选项卡显示的下标
                playerOptions: {
                    playbackRates: [0.7, 1.0, 1.5, 2.0], // 播放速度
                    autoplay: false, //如果true,则自动播放
                    muted: false, // 默认情况下将会消除任何音频。
                    loop: false, // 循环播放
                    preload: 'auto',  // 建议浏览器在<video>加载元素后是否应该开始下载视频数据。auto浏览器选择最佳行为,立即开始加载视频（如果浏览器支持）
                    language: 'zh-CN',
                    aspectRatio: '16:9', // 将播放器置于流畅模式，并在计算播放器的动态大小时使用该值。值应该代表一个比例 - 用冒号分隔的两个数字（例如"16:9"或"4:3"）
                    fluid: true, // 当true时，Video.js player将拥有流体大小。换句话说，它将按比例缩放以适应其容器。
                    sources: [{ // 播放资源和资源格式
                        type: "video/mp4",
                        src: "http://img.ksbbs.com/asset/Mon_1703/05cacb4e02f9d9e.mp4" //你的视频地址（必填）
                    }],
                    poster: "../static/image/course-cover.jpeg", //视频封面图
                    width: document.documentElement.clientWidth, // 默认视频全屏时的最大宽度
                    notSupportedMessage: '此视频暂无法播放，请稍后再试', //允许覆盖Video.js无法播放媒体源时显示的默认信息。
                }
            }
        },
        created() {
            this.course_id = this.$route.params.course; // 获取路由路径参数
            // console.log( this.$route.query.username ); // 获取链接地址中的查询字符串
            this.get_course();
            this.get_chapter();
        },
        methods: {
            get_course() {
                let self = this;
                if (this.course_id < 1) {
                    this.$alert("对不起，当前课程地址不存在！", "路飞学城", {
                        callback() {
                            self.$router.go(-1);
                        }
                    });
                    return false;
                }

                // 获取课程信息
                this.$axios.get(`${this.$settings.Host}/courses/${this.course_id}/`).then(response => {
                    this.course = response.data;
                    // 替换课程详情中的图片地址
                    let data = this.course.brief;
                    let str = `src="/media`;
                    while (data.search(str) != "-1") {
                        data = data.replace(str, `src="${this.$settings.Host}/media`);
                    }
                    this.course.brief = data;
                    // 替换播放器中的视频和封面图片
                    this.playerOptions.sources[0].src = response.data.course_video;
                    this.playerOptions.poster = response.data.course_img;
                    // 进行活动倒计时
                    let t = setInterval(() => {
                        if (this.course.has_time > 1) {
                            this.course.has_time -= 1;
                        } else {
                            // 活动结束
                            this.course.has_time = 0;
                            this.course.discount_name = "";
                            this.course.discount_price = -1;
                            clearInterval(t);
                        }
                    }, 1000)
                }).catch(error => {
                    this.$message.error("对不起，获取课程信息失败！");
                })
            },
            get_chapter() {
                // 获取指定课程的章节列表
                this.$axios.get(`${this.$settings.Host}/courses/chapter/`, {
                    params: {
                        course: this.course_id,
                    }
                }).then(response => {
                    this.chapter_list = response.data;
                }).catch(error => {
                    this.$message.error("对不起，获取课程的章节信息失败！")
                })
            },
            add_cart() {
                // 添加商品到购物车
                // 验证用户是否登录了，
                let token = this.$settings.token();
                if (!token) {
                    this.$confirm('对不起，您尚未登录请登录后继续操作, 是否继续?', '路飞学城', {
                        confirmButtonText: '登录',
                        cancelButtonText: '取消',
                        type: 'warning'
                    }).then(() => {
                        this.$router.push("/login");
                    }).catch(() => {
                    });

                    return false; // 阻止代码继续往下执行
                }

                // 发送请求
                this.$axios.post(`${this.$settings.Host}/cart/`, {
                    course_id: this.course_id,
                }, {
                    headers: {
                        Authorization: "jwt " + token,
                    }
                }).then(response => {
                    this.$message.success("成功添加商品到购物车！");
                }).catch(error => {
                    this.$message.error("添加商品到购物车失败！");
                })
            }
        },
        components: {
            Header,
            Footer,
            videoPlayer,
        }
    }
</script>

<style scoped>
  .main {
    background: #fff;
    padding-top: 30px;
  }

  .course-info {
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
  }

  .wrap-left {
    float: left;
    width: 690px;
    height: 388px;
    background-color: #000;
  }

  .wrap-right {
    float: left;
    position: relative;
    height: 388px;
  }

  .course-name {
    font-size: 20px;
    color: #333;
    padding: 10px 23px;
    letter-spacing: .45px;
  }

  .data {
    padding-left: 23px;
    padding-right: 23px;
    padding-bottom: 16px;
    font-size: 14px;
    color: #9b9b9b;
  }

  .sale-time {
    width: 464px;
    background: #fa6240;
    font-size: 14px;
    color: #4a4a4a;
    padding: 10px 23px;
    overflow: hidden;
  }

  .sale-type {
    font-size: 16px;
    color: #fff;
    letter-spacing: .36px;
    float: left;
  }

  .sale-time .expire {
    font-size: 14px;
    color: #fff;
    float: right;
  }

  .sale-time .expire .second {
    width: 24px;
    display: inline-block;
    background: #fafafa;
    color: #5e5e5e;
    padding: 6px 0;
    text-align: center;
  }

  .course-price {
    background: #fff;
    font-size: 14px;
    color: #4a4a4a;
    padding: 5px 23px;
  }

  .discount {
    font-size: 26px;
    color: #fa6240;
    margin-left: 10px;
    display: inline-block;
    margin-bottom: -5px;
  }

  .original {
    font-size: 14px;
    color: #9b9b9b;
    margin-left: 10px;
    text-decoration: line-through;
  }

  .buy {
    width: 464px;
    padding: 0px 23px;
    position: absolute;
    left: 0;
    bottom: 20px;
    overflow: hidden;
  }

  .buy .buy-btn {
    float: left;
  }

  .buy .buy-now {
    width: 125px;
    height: 40px;
    border: 0;
    background: #ffc210;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
    margin-right: 15px;
    outline: none;
  }

  .buy .free {
    width: 125px;
    height: 40px;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 15px;
    background: #fff;
    color: #ffc210;
    border: 1px solid #ffc210;
  }

  .add-cart {
    float: right;
    font-size: 14px;
    color: #ffc210;
    text-align: center;
    cursor: pointer;
    margin-top: 10px;
  }

  .add-cart img {
    width: 20px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
  }

  .course-tab {
    width: 100%;
    background: #fff;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px 0 #f0f0f0;

  }

  .course-tab .tab-list {
    width: 1200px;
    margin: auto;
    color: #4a4a4a;
    overflow: hidden;
  }

  .tab-list li {
    float: left;
    margin-right: 15px;
    padding: 26px 20px 16px;
    font-size: 17px;
    cursor: pointer;
  }

  .tab-list .active {
    color: #ffc210;
    border-bottom: 2px solid #ffc210;
  }

  .tab-list .free {
    color: #fb7c55;
  }

  .course-content {
    width: 1200px;
    margin: 0 auto;
    background: #FAFAFA;
    overflow: hidden;
    padding-bottom: 40px;
  }

  .course-tab-list {
    width: 880px;
    height: auto;
    padding: 20px;
    background: #fff;
    float: left;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }

  .tab-item {
    width: 880px;
    background: #fff;
    padding-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }

  .tab-item-title {
    justify-content: space-between;
    padding: 25px 20px 11px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51, 51, 51, .05);
    overflow: hidden;
  }

  .chapter {
    font-size: 17px;
    color: #4a4a4a;
    float: left;
  }

  .chapter-length {
    float: right;
    font-size: 14px;
    color: #9b9b9b;
    letter-spacing: .19px;
  }

  .chapter-title {
    font-size: 16px;
    color: #4a4a4a;
    letter-spacing: .26px;
    padding: 12px;
    background: #eee;
    border-radius: 2px;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
  }

  .chapter-title img {
    width: 18px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
  }

  .lesson-list {
    padding: 0 20px;
  }

  .lesson-list .lesson-item {
    padding: 15px 20px 15px 36px;
    cursor: pointer;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
  }

  .lesson-item .name {
    font-size: 14px;
    color: #666;
    float: left;
  }

  .lesson-item .index {
    margin-right: 5px;
  }

  .lesson-item .free {
    font-size: 12px;
    color: #fff;
    letter-spacing: .19px;
    background: #ffc210;
    border-radius: 100px;
    padding: 1px 9px;
    margin-left: 10px;
  }

  .lesson-item .time {
    font-size: 14px;
    color: #666;
    letter-spacing: .23px;
    opacity: 1;
    transition: all .15s ease-in-out;
    float: right;
  }

  .lesson-item .time img {
    width: 18px;
    height: 18px;
    margin-left: 15px;
    vertical-align: text-bottom;
  }

  .lesson-item .try {
    width: 86px;
    height: 28px;
    background: #ffc210;
    border-radius: 4px;
    font-size: 14px;
    color: #fff;
    position: absolute;
    right: 20px;
    top: 10px;
    opacity: 0;
    transition: all .2s ease-in-out;
    cursor: pointer;
    outline: none;
    border: none;
  }

  .lesson-item:hover {
    background: #fcf7ef;
    box-shadow: 0 0 0 0 #f3f3f3;
  }

  .lesson-item:hover .name {
    color: #333;
  }

  .lesson-item:hover .try {
    opacity: 1;
  }

  .course-side {
    width: 300px;
    height: auto;
    margin-left: 20px;
    float: right;
  }

  .teacher-info {
    background: #fff;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }

  .side-title {
    font-weight: normal;
    font-size: 17px;
    color: #4a4a4a;
    padding: 18px 14px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51, 51, 51, .05);
  }

  .side-title span {
    display: inline-block;
    border-left: 2px solid #ffc210;
    padding-left: 12px;
  }

  .teacher-content {
    padding: 30px 20px;
    box-sizing: border-box;
  }

  .teacher-content .cont1 {
    margin-bottom: 12px;
    overflow: hidden;
  }

  .teacher-content .cont1 img {
    width: 54px;
    height: 54px;
    margin-right: 12px;
    float: left;
  }

  .teacher-content .cont1 .name {
    float: right;
  }

  .teacher-content .cont1 .teacher-name {
    width: 188px;
    font-size: 16px;
    color: #4a4a4a;
    padding-bottom: 4px;
  }

  .teacher-content .cont1 .teacher-title {
    width: 188px;
    font-size: 13px;
    color: #9b9b9b;
    white-space: nowrap;
  }

  .teacher-content .narrative {
    font-size: 14px;
    color: #666;
    line-height: 24px;
  }
</style>
